Riker sets his sights on Otis Trask, the leader of a gang of arsonists.

Riker learns about a peculiar school in prison where inmates are taught criminal techniques so he decides to close it down once and for all.

Riker goes after a gang specialized in robbing Government munitions.

A woman hires Riker to locate her missing sister lest she's become a prostitute. Undercover man Riker portrays a procurer in an attempt to find a woman's young sister who's turned to prostitution.

An ex-girlfriend of Riker's asks him to investigate the threats of a liquor distributor at her brother.